Top Definition
Ballpumping forces fluids into different tissues at different rates. The testicles enlarge faster than the sac, just as the core of the cock enlarges faster than the skin. So if you pump a short session, you'll get big eggs hanging in your sac. If you go for a real long session, you'll get a big bloated "grapefruit" sac.
I was Tiger Pumping so much my balls exploded.
by deftonepiper August 30, 2008
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